powerpc: Add of_find_next_cache_node()
We have more than one piece of code that looks up cache nodes manually using the "l2-cache" property. Add a common helper routine which does this and handles ePAPR's "next-level-cache" property as well as powermac. Signed-off-by: NNathan Lynch <ntl@pobox.com> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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